package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;


// 注解
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();

        req.setCharacterEncoding("utf-8");
        String action = req.getParameter("action");
        if("list".equals(action)){
            List<User> users = userService.findAll(new User());

            // 存储对象到作用域中
            req.setAttribute("users", users);
            // 跳转到对应的视图显示数据
            req.getRequestDispatcher("/list.jsp").forward(req, resp);

        } else if ("add".equals(action)) {
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");


            int result = userService.addUser(new User(name,pass));

            // 重定向
            if (result>0) {
                resp.sendRedirect("user?action=list");
            }


        } else if ("delete".equals(action)) {
            req.setCharacterEncoding("UTF-8");
            // 拿到网页传递过来的用户名和密码
            String sid = req.getParameter("id");

            Integer id = Integer.parseInt(sid);

            // 根据id查询用户信息
            int result = userService.deleteUserById(id);

            if (result > 0) {
                // 重定向到查询所有用户的页面
                resp.sendRedirect("user?action=list");
            }

        }else if ("toupdate".equals(action)) {
            req.setCharacterEncoding("UTF-8");
            // 拿到网页传递过来的用户名和密码
            String sid = req.getParameter("id");

            Integer id = Integer.parseInt(sid);

            // 根据id查询用户信息
            User user = userService.findById(id);

            // 将查询到的用户信息存储到作用域中
            req.setAttribute("user", user);
            req.getRequestDispatcher("update.jsp").forward(req, resp);
        }
        else if ("update".equals(action)) {
            req.setCharacterEncoding("UTF-8");
            // 获取页面隐藏的id
            String sid = req.getParameter("id");
            Integer id = Integer.parseInt(sid);
            // 拿到网页传递过来的用户名和密码
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");


            int result = userService.updateUser(new User(id,name,pass));

            // 重定向
            resp.sendRedirect("user?action=list");


        }


    }
}
